1007.1.1 Two exits or exit access doorways.
BC § 1007.1.1
Where two exits, exit access doorways, exit access stairways or ramps, or any combination thereof, are required from any portion of the exit access, they shall be placed a distance apart equal to not less than one-half of the length of the maximum overall diagonal dimension of the building or area to be served measured in a straight line between them. Stairs sharing any common wall, floor, ceiling, scissor stair assembly, or other enclosure shall be counted as one exit stairway. Exceptions: 1. Corridor measurements. Where interior exit stairways or ramps are interconnected by a 1-hour fire-resistance-rated corridor conforming to the requirements of Section 1020, the required exit separation shall be measured along the shortest direct line of travel within the corridor.
2.Remote location in sprinklered buildings. Where a building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2, the separation distance shall be not less than one-third of the length of the maximum overall diagonal dimension of the area served.
3.Group R-2 occupancies. In Group R-2 occupancies, where stairs are enclosed in walls having at least a 2-hour fire resistance rating and constructed of masonry or masonry equivalent in accordance with department rules: 3.1. The exit doors to such stairs shall be placed a distance apart equal to no less than 15 feet (4572 mm); and 3.2. Such stairs shall be permitted to share common walls, floors, ceilings or scissor stairs assemblies or other enclosures provided that the construction separating the stairs is also of at least a 2-hour fire-resistance rating and constructed of masonry or masonry equivalent in accordance with department rules.
4.Group B occupancies. In Group B occupancies of construction Type I or II not exceeding 60 feet (18 288 mm) in height, not exceeding 2,000 square feet (185.8 m 2 ) on any story and not exceeding a travel distance of 50 feet (15 240 mm) on any story, where stairs are enclosed in walls having at least a 2-hour fire-resistance rating and constructed of masonry or masonry equivalent in accordance with department rules: 4.1. The exit doors to such stairs shall be placed a distance apart equal to no less than 15 feet (4572 mm); and 4.2. Such stairs shall be permitted to share common walls, floors, ceilings or scissor stairs assemblies.
